David Knowlton, MD
Family Medicine Physician · Springfield, OR
David Knowlton, MD is a family medicine physician with a practice address in Springfield, Oregon, and NPI 1902975741, issued on Nov 7, 2006. Check the license (Oregon MD20529, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- David Knowlton
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD20529 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1435 G St, Springfield, OR 97477
- Phone
- (541) 735-9420
- Enumerated
- Nov 7, 2006
- Record last updated
- May 25, 2022
- Fax
- (541) 747-9870
- Medicaid ID
- 150376 OR
- Medicare enrollment
- Enrolled (PECOS I20040623000287); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Also registered at 1435 G St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eric Allard, PA-CPhysician Assistant1396320396
- Miranda Barlow, DNP, FNPFamily Nurse Practitioner1588042030
- Joseph Beal, MA, QMHP-R, CADC-RMental Health Counselor1942886403
- Crystal Bruce, QMHA-RMental Health Counselor1073251856
- Sebastian BrunningMedical Physician Assistant1205453420
- Ashley Bryson, MDFamily Medicine Physician1356704159
Verify David Knowlton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD20529Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average family medicine physician in 2024
6,643 Medicare Part D claims for 366 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 574 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen257 claims
- Atorvastatin Calcium246 claims
- Levothyroxine Sodium232 claims
- Gabapentin215 claims
- Lisinopril212 claims
- Omeprazole171 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $62.17
3 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- G Street Integrated HealthSpringfield, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Knowlton among 2,847 family medicine physician records in Oregon
David Knowlton, MD is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 53% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1990 · median 2009 among the 1,671 with a school on file
- Record last updated2022 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
51 family medicine physician records list a practice address in Springfield
They are 51 of the 2,209 NPPES records with a practice address in Springfield, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in Springfield → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Patricia Ahlen, MDSpringfield, OR 974771083681860
- John Ahlen, MDSpringfield, OR 974771669449898
- Michael Findley, M.D.Springfield, OR 974771154320380
- Warren Griffith, D.O.Springfield, OR 974771932180049
- Kenneth Hanson, D.O.Springfield, OR 974771710950324
- Douglas Jeffrey, MDSpringfield, OR 974771174592117
- Graham Kaiser, D.O.Springfield, OR 974771598731903
- Steven Lambros, M.D.Springfield, OR 974771730156399
Common questions
What is David Knowlton, MD's NPI number?
David Knowlton, MD's National Provider Identifier (NPI) is 1902975741, issued on Nov 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David Knowlton, MD located?
The NPPES record lists a practice address at 1435 G St, Springfield, OR, 97477. Phone: (541) 735-9420. Providers update this record themselves, so call before visiting.
How can I verify David Knowlton, MD's license?
NPPES lists Oregon license number MD20529, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David Knowlton, MD prescribe under Medicare Part D?
In 2024, David Knowlton, MD had 6,643 Medicare Part D claims for 366 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.